double f(double a, double b, double c) {
double r3855359 = a;
double r3855360 = b;
double r3855361 = r3855359 + r3855360;
double r3855362 = c;
double r3855363 = r3855361 + r3855362;
double r3855364 = 2.0;
double r3855365 = r3855363 / r3855364;
double r3855366 = r3855365 - r3855359;
double r3855367 = r3855365 * r3855366;
double r3855368 = r3855365 - r3855360;
double r3855369 = r3855367 * r3855368;
double r3855370 = r3855365 - r3855362;
double r3855371 = r3855369 * r3855370;
double r3855372 = sqrt(r3855371);
return r3855372;
}